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• Before starting to operate on the appliance, it is necessary to check the
zone surrounding the equipment to make sure there are no dangers of
fire nor risks of combustion.
To repair the refrigerating system, it is necessary to take the following
precautions before starting the intervention on the system.
1.
The zone MUST be checked with a specific refrigerating liquids detector
before and during work, so that the technician is aware of potentially
flammable atmospheres. Make sure the detection device of the leaks
is suitable for use with flammable refrigerants, then that it does not
produce sparks and that is adequately sealed or intrinsically safe.
2.
The leakage electronic detectors may need calibration.
If necessary, calibrate them in a zone free of refrigerant.
3.
Make sure the detector is not a potential source of combustion and
that it is suitable for the refrigerant used. The device for detection
must be set at a percentage of the refrigerant LFL and must be
calibrated for the used refrigerant; the appropriate percentage of
gas (maximum 25 %) must be confirmed.
3a. The leakage detection fluids are suitable for most of the refrigerants.
The detergents containing chlorine MUST be avoided.
Danger of corrosion of the copper pipes.
4.
If the presence of a leak is suspected, all open flames must be
removed.
5.
All sources of combustion (even a lit cigarette) should be kept away from
the place in which all operations during which the flammable refrigerant
may be released in the surrounding space must be carried out.
6.
Make sure the area is adequately ventilated before intervening inside
the system; a continuous degree of ventilation must be present.
7.
Before any operation, always check that:
• the condensers are unloaded. The operation must be carried out
safely to avoid the risk of producing sparks;
• there are no live electrical components and that the cables are not
exposed while loading, recovering or bleeding the system;
• there is continuity in the ground connection.
8.
Periodically check that the cables are not subject to wear, corrosion,
excessive pressure, vibrations, sharp edges or any other hostile
environmental situation.
9.
When intervening inside the refrigerating circuit to carry out repairs
or for any other reason, the conventional procedures must be
followed:
• remove the refrigerant;
• bleed the circuit with an inert gas;
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